"fix" what, exactly? The exploit basically points the system's bootloader to the SD card. I still don't get what people's fixation with this "issue" is anyways, do they REALLY use a system without an SD card all that often? Are they afraid of the SD card failing? (If so, it's as simple as frequently backing up your SD card, the same way as you would with any other data, and if push REALLY comes to shove, you can simply use a new SD card and pop on the firmware files, and you're good to go) Also, I'd be more than curious how exactly you intend to install games should this ever be "fixed"? (Here's a hint, the system itself doesn't have enough room open to fit an average game without an SD card). As it stands, you're actually further up shit creek (pardon the language) if you're using a menuhax setup, because 1. You're already relying on an SD card for the system to boot into the environment you're using, and 2. This is a bit harder to recover from, should your SD card take a nosedive on you...
Edit: and to address the one and only reasonable concern, keep a backup of sysnand before you install a9lh on it, if you have any possible intent on selling the system off long term, this can be used to bring you back to a full on factory system.